TYAN TOMCAT IVS D Manual page 36

w Memory Hole at 15M-16M
Some ISA cards may not function correctly when more than 16MB of
RAM is installed. If this is the case, then enable this option. Most ISA
card should work fine with this option disabled.
The default is disabled.
w IDE HDD Block Mode
This option allows the hard disk controller to use fast block mode
transfer to and from the hard disk drive. The hard drive must support
block mode transfer for this option to be enabled.(Most new drives do.)
If you are not sure if your drive supports this, call your hard drive
vendor. The default is enabled.
w IDE 32-bit Transfer Mode
Enabling 32-bit transfer mode allows faster access to data on your hard
disk drive. Not all drives will support this feature.
The default is enabled.
w IDE Primary/Secondary Master/Slave PIO
Rather than have the BIOS issue a series of commands to effect a
transfer to or from the disk drive, PIO(Programmed Input/Output)
allows the BIOS to tell the controller what it wants and lets the
controller and the CPU perform the complete task themselves. This
method is simpler, more efficeint and faster. This BIOS supports five
modes (0 thru 4) and can be set by the user or set to Auto detect.
The default is Auto.
w On-Chip Primary/Secondary PCI IDE
This option enables or disables the on board PCI IDE controllers.
The default is enabled.
w PCI Slot IDE 2nd Channel
This option allows you to designate an IDE controller board inserted into
one of the physical PCI slots as a secondary IDE controller. If you don't
have a third party PCI IDE controller installed, this option should be
disabled. The default is disabled.
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